Ladies and Gents, I recently purchased a Vandy Vape Pulse and came across an issue. I was advised on a Facebook group that with the purchased batteries (Samsung 18650 25R), they would be unsuitable for the mech. prior to seeking advice, I did notice that the my coils were slow to heat up so I wasn't getting great clouds and vapour. It was recommended to me to purchase Sony VTC5A batteries for the mech. this has left me slightly confused. Any help would be gratefully appreciated. Many thanks.